# -*- encoding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution	
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import time

def som(cr, uid, partner_id, args):
    result = args['som_interval_default']
    max = args['som_interval_max'] or 4
    factor = args['som_interval_decrease']
    date_start=time.time() - args['som_interval']*3600*24*max
    for i in range(max):
        next_date = date_start + args['som_interval']*3600*24
        cr.execute(
             '''
             select s.factor from res_partner_event e
             left join res_partner_som s
             on (e.som=s.id) where partner_id=%s and date>=%s and date<%s''', 
             (partner_id, 
              time.strftime('%Y-%m-%d', time.gmtime(date_start)),
              time.strftime('%Y-%m-%d', time.gmtime(next_date))))

        soms = cr.fetchall()
        if len(soms):
            c = 0
            nbr = 0.0
            for som in soms:
                if som[0]:
                    c+=1
                    nbr+=som[0]
            if c:
                avg = nbr/c
            else:
                avg = result
            result = result*(1-factor) + (avg*factor)
        else:
            avg = args['som_interval_default']
        date_start = next_date
    return result



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